[cfe-dev] [StaticAnalyser] hiding unwanted unreachable code warning in macro

[Daniel Marjamäki via cfe-dev]

Hello!

I would like to somehow hide an unwanted unreachable code warning in a macro.

Example code:

    #define MACRO(A,B)   do{return;}while(0)

    void asd() {
	MACRO(1,2);
    }

Clang says that condition "0" is never executed. This is true but well that while(0) is there for a good reason.

I guessed that a workaround would be to write:

    #define MACRO(A,B)   ({return;})

but clang warns about this too. and anyway this syntax is also less familiar than "do {} while (0)". 

What should I do? Can I write a fix that hide "unreachable code" warnings in macros? To me it seems that in general such warnings should be hidden.

Best regards,
Daniel Marjamäki

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Daniel Marjamäki Senior Engineer
Evidente ES East AB  Warfvinges väg 34  SE-112 51 Stockholm  Sweden

Mobile:                 +46 (0)709 12 42 62
E-mail:                 Daniel.Marjamaki at evidente.se

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